Water heater



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WATER HEATER Filed Feb. 1i, 1924 Jul-Q 59 192i?.

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Puentes July 5,1927.

s UNITED Parar FRANK W. SEUELIi, OF DETROT, MCHIGAN, ASSIGNOR T0EVERl'gQ- HEATER 03M.- PANY, F DETROIT, MICBIGAN, A. CORYGI'LATXON OFllzICH-.ZC

WATER HETER.

Application flied February 4, 3924. Serial No. 690,6i3. l

'-LThe invention relates to water heaters ot that type in which theheating Haine is arranged beneath the end of a cylindrical tank, theproducts of combustion from said llame assing upward around the walls ofthe tank ietween thesaine and a surrounding jacket. With suchconstruction it is desirable to hold the hot gases in close contact withthe walls o the tank so as to secure the greatest ef.

ficiency in transferring lthe heat. On the other hand, it is equallyimportant toavoid interference with combustion and proper draft forcarrying away the gaseous products. Therefore, in designing theconstruction the must neither be too large nor too small, but is soproportioned as to carry away the gases while maintaining contact withthe surface to be heated. There is, however, a ditliculty arisinfrointhe fact that as the gases cool, they ecrease in volume. section ofthe flue at the base of the tank is suicient for the passa e of the hotgases, this same section wilill e larger than is needed for the coolergases at a higlieipoint, which both diminishes the velocity andinterferes with close contact or scrubbing action.

It is one of the features of the present invention to avoid this defectby as construction in which the cross section ot the ue is diminishedvfor the cooler gases. lt is a furtherrobject to provide a construction o'acket which at the base will withstand the eat and is of suicientstrength to support the weight of the tank, whileabove the base it is oflighter weight and provides smaller llue'space. Still further theinvention consistsv in various features of construction as hereinafterset forth.

In the drawings:

Figure 1 is a vertical central section through a water heater of myimproved construction;

Figure 2 is a similar View showing a modied construction.

A is the water holding tank, B is a cylindrical casing surrounding theba'se portion of the tank, being preferably formed of cast iron andbeing provided with a plurality of inwardly projecting lugs C formarginally supporting the tank. The casing B is suitably supported as bya base ring D, which in turn is mounted upon legs E. F is an upper jacket section, which is preferably formed of sheet metal and issupportedon a ledge G flue space between. the jacket and the tankl Thus if thecross formed at the upper end of the ycasing' l. As shown in Figure l,the ledge G is foi-'ined by a bead.project1ng inwardly from the memberB, but in the modified constructionv latter is greater than the fluearea between the tank and the upper jacket section. This will compensatefor contraction in volume of the gases due to cooling will maintain morenearly uniform velocity.

ln the manufacture ot water tanks one head is usually convex andissecured to the cylindrical body by an inwardly extending annular angeriveted thereto. lt is not, however, possible to make both ends this wayas it would be'practically impossible to rivet the head last secured ifthe flange thereot were to extend inward. Therefore, it is the practiceto arrange one head inward and the other head outward. With myconstruction of. heater the convex or vinwardly flanged head J is placedat the base, While the out- Wardly flanged head K is arranged at thetop. However, this latter head, instead of being concave throughout itsextent, is reversel dished so as to be convex, thereby resulting ingreater strength to withstand internal pressure and also diminishing thegas pocket, which would otherwise be vformed at the top of the tank.

To produce the highest eiciency the jacket is surrounded with heatinsulating-material, which in turn is enclosed within an outer jacket.To retain the two jackets and the tank in concentric relation, there isprovided at the top a metal cap L, 'which is (lll Sfl

stepped or offset at M to form a bearing for the jacket F and isprovided with a pelripheral'lange N for engaging the outer jacket O. Thecap L centrally engages the nipple P which forms the outlet for the hotwater, and this also holds said cap in concentric relation to the tank.

To protect the flame from drafts a' bottom lGO head or shield isarranged therebeneatli, but

provisioninust be made for admission of air Q gli thing@ D" Vwhich isiiiitiiinilefl hy ii flange Q extending." iigiwziitl from the mp orsliiiltl ll. 'l`hiif1 thil :iir which is nihiiittetl to thetonihiietiiin clitiinhiiinisiw ilpiiiiitl :ii'oiiiitl thc thiiici' :intldownward hctwcen tht` Filme :iiitl thi` thinggi` D', while theoverlappinglr of riiiitl lzinii'es torina ii light Shit-lil.

With thc construction :is ili'erici'ihctl. the tzi t iioii liiisc l,together with thc ring l) :intl legs lh forum :i siihstzintinl supportfor the tziiili :intl will zilso withstand the heut: ol' thilroiiiliiistioii chiiiiihcr. Furthermore, ihrA spin-e hctiiccn thecasing: B :incl the lower cnil ot' thc tiink is siitliciciit for thepassage ol' the .gziecoiis iiroihicts' of combustion Withtiiitiiitei'l't-i'ciii-c with the tliiiiic. Ahove thc ii|iii0icnil ot' thtlciisiiigl the sheet iiietiil jziifltct l is siifliifif-nt, to retain thecooler gmt-s :intl iin :ivi-mint of the diminished ili- :iiiictii otthis portion of the jacket, the #hic :inw is contracted so as tocompensate t`^r thil rontitiiition in voliinic of the gases. l'tmthefuses pass over the top of the-tank, they :igziin iiiipinge against theconvex p0rtion of i the hczitl I( :intl linnlly es'iipc throiilh theVent, lliie Si. 'llie spiice between the Jackets (li, l? :imi (l islilletl with siiitiihle lieiit insulating iiiiitcriiil, so that thi`giciiter pui-t ot' the limit iii thc gaseous products' iscoiiiiiiiiiiiciitcd to thc tank :intl is utilized in limitingY tlicwaiter.

What l chiiiii :is my invention is:

ln :i witter limiter, the coinbiniitioii with :1 vertically iii-rangedcylindrical tank, of a casing foriiieil o iiist iiietzil havin(yinwardly extending liigs-for engaging an upport ing sind tank. siiitllugs being fashioned t0 `guide siiifl tniilc into` concentric relationwith siiiil casing, :i Amet nietiil jacket extending tilin'iiitl l'roiiisaid casing ziiitl surrounding Saiid tank7 :in outlet: conduit from saidtank iii-ranged zit the center of the upper end thereof, and :i Iiiet'alcup aportured for the passage of siiid outlet :ind engaging the upperend of said jacket to hold the Siiiiic in concentric relation to thetank.

In testimony whereof I affix my signature.

FRANK XV. SHUELL.

